HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Wisconsin

$62+ Cheap flights from Ontario (ONT) to Wisconsin

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Wisconsin with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find flight deals from Ontario to Wisconsin

Cheapest flights from Ontario to Wisconsin
Explore the most affordable flight options available from Ontario to Wisconsin. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2025.

This CheapOair deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:45 amONT - MSP
1 stop15h 08mFrontier
Wed 1/710:40 amMSP - ONT
1 stop14h 34mFrontier
Deal found 11/18$134
This CheapOair deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/112:58 amONT - MSP
1 stop19h 16mFrontier
Sat 12/67:00 amMSP - ONT
1 stop9h 25mFrontier
Deal found 11/18$137
This CheapOair deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:45 amONT - MSP
1 stop15h 08mFrontier
Tue 1/610:40 amMSP - ONT
1 stop14h 34mFrontier
Deal found 11/18$138
This Frontier deal was found by Cheapflights users on 11/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:45 amONT - MSP
1 stop12h 06mFrontier
Sun 1/410:00 pmMSP - ONT
1 stop11h 24mFrontier
Deal found 11/17$141
This Frontier deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/123:20 pmONT - MSP
1 stop6h 42mFrontier
Sun 12/147:00 amMSP - ONT
1 stop10h 06mFrontier
Deal found 11/18$142
This CheapOair deal was found by Cheapflights users on 11/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:45 amONT - MSP
1 stop15h 17mFrontier
Thu 1/16:45 amMSP - ONT
1 stop19h 14mFrontier
Deal found 11/17$144
This Mytrip deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:45 amONT - MSP
1 stop15h 17mFrontier
Wed 1/710:40 amMSP - ONT
1 stop14h 34mFrontier
Deal found 11/19$159
This CheapOair deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:45 amONT - MSP
1 stop9h 54mFrontier
Mon 1/59:46 pmMSP - ONT
1 stop26h 26mFrontier
Deal found 11/19$161
This Frontier deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/133:20 pmONT - MSP
1 stop5h 54mFrontier
Sun 1/410:00 pmMSP - ONT
1 stop11h 24mFrontier
Deal found 11/19$164
This Priceline deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/82:59 pmONT - ORD
1 stop6h 58mFrontier
Mon 12/1512:59 pmORD - ONT
1 stop10h 18mFrontier
Deal found 11/18$176
This Frontier deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/152:59 pmONT - ORD
1 stop6h 58mFrontier
Wed 12/319:34 pmORD - ONT
1 stop13h 19mFrontier
Deal found 11/19$177
This CheapOair deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/112:58 amONT - MSP
1 stop19h 16mFrontier
Sun 12/77:07 pmMSP - ONT
1 stop21h 18mFrontier
Deal found 11/19$178

Cheap flight deals from Ontario to Wisconsin

Keep the following information in mind while searching for Ontario to Wisconsin flight deals. Data was last updated November 20, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$127
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$463
Provider with most accurate pricing for Los Angeles-Milwaukee-Mitchell flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Milwaukee-Mitchell flights.
Search Deals
From Ontario to Wisconsin
Search Deals
One-way flight from Ontario to Wisconsin
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Wisconsin that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 20, 2025.
Use the filters below to find and compare flights from Ontario to Wisconsin that are best for you.

Fly from

Ontario

Fly to

Wisconsin

Route

Depart

Return

Price

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 1/24

7:30 am-9:52 pm

2 stops12h 22m

Chicago O'Hare Intl

Wed 1/28

7:30 am-4:15 pm

2 stops10h 45m

$254

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 12/13

12:40 pm-11:59 pm

1 stop9h 19m

Chicago O'Hare Intl

Tue 12/16

7:20 am-12:34 pm

1 stop7h 14m

$265

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 2/18

7:30 am-11:55 pm

1 stop14h 25m

Chicago O'Hare Intl

Tue 2/24

7:40 am-10:40 pm

1 stop17h 00m

$265

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/7

6:00 am-1:38 pm

1 stop5h 38m

Chicago O'Hare Intl

Mon 1/12

2:20 pm-10:51 pm

1 stop10h 31m

$270

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 2/5

10:30 pm-8:42 am

1 stop8h 12m

Chicago O'Hare Intl

Sat 2/7

5:30 am-11:31 am

1 stop8h 01m

$282

OntarioMadison

ONT - MSN

ONTMSN

Ontario

Wed 1/7

10:58 am-9:11 pm

1 stop8h 13m

Madison Truax Field

Sun 1/11

11:23 am-5:22 pm

1 stop7h 59m

$289

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Tue 3/31

7:00 am-4:43 pm

1 stop7h 43m

Green Bay Austin-Straubel

Sat 4/4

5:18 pm-10:26 pm

1 stop7h 08m

$289

OntarioGreen Bay

ONT - GRB

ONTGRB

Ontario

Sat 3/28

11:59 pm-9:45 am

1 stop7h 46m

Green Bay Austin-Straubel

Thu 4/2

2:45 pm-10:26 pm

1 stop9h 41m

$289

OntarioDuluth

ONT - DLH

ONTDLH

Ontario

Wed 1/21

6:00 am-7:35 pm

2 stops11h 35m

Duluth Intl

Sat 1/24

11:56 am-9:05 pm

2 stops11h 09m

$289

OntarioMadison

ONT - MSN

ONTMSN

Ontario

Mon 12/29

6:45 am-2:01 pm

1 stop5h 16m

Madison Truax Field

Mon 1/5

2:56 pm-11:59 pm

1 stop11h 03m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to Wisconsin

Have a flexible travel schedule? Discover the best time to fly to Wisconsin from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Wisconsin

What is the cheapest month to book a flight from Ontario to Wisconsin?

Currently, May is the cheapest month in which you can book a flight from Ontario to Wisconsin (average of $99). Flying from Ontario to Wisconsin in December is currently the most expensive (average of $267). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to WI?

Find hourly flight availability from Ontario to Wisconsin. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 20, 2025.

It’s optimal to fly from Ontario to Wisconsin at noon. By choosing this option you can save up to 22% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Ontario to Wisconsin?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Wisconsin. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Wisconsin flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Wisconsin

Get insights into the airlines that provide service to Wisconsin. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Wisconsin. Reviews last updated November 20, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to Wisconsin. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,251 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,002 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,028 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,047 reviews
Southwest
8.0
Very good
4,251 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Wisconsin. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Wisconsin?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Wisconsin.

  • How long is the flight from Ontario to Wisconsin?

    Delta, American Airlines, and United Airlines can get you from Ontario to Wisconsin in just under 7h 43m. Your travel time can differ by up to 4h 39m. Airlines will cover a distance of 1720 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Ontario to Wisconsin one-way?

    $65 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and American Airlines, with prices starting from $133 and $154, respectively.

  • What are the most popular routes from Ontario to Wisconsin?

    The most popular flight routes from Ontario to Wisconsin are Ontario - Chicago O'Hare Intl, Ontario - Minneapolis St Paul and Ontario - Milwaukee-Mitchell.

  • Can I find deals for flights from Ontario to Wisconsin that include hotel bookings?

    Yes. In addition to deals on Ontario to Wisconsin flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Wisconsin?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Wisconsin.

  • Can I find deals for business class flights from Ontario to Wisconsin?

    Yes. Cheapflights offers flight deals from Ontario to Wisconsin by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Wisconsin?

    Currently, May is the cheapest month in which you can book a flight from Ontario to Wisconsin (average of $99). Flying from Ontario to Wisconsin in December is currently the most expensive (average of $267). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Wisconsin

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Los Angeles to Newark flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
San Francisco to Los Angeles flights
Los Angeles to LaGuardia flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Honolulu flights
San Francisco to Las Vegas flights
San Francisco to Newark flights
Los Angeles to San Francisco flights
San Francisco to Honolulu flights
Ontario to San Francisco flights
Los Angeles to Miami flights
Los Angeles to Fort Lauderdale flights
Los Angeles to Las Vegas flights
San Francisco to Dallas/Fort Worth flights
San Francisco to LaGuardia flights
Los Angeles to O'Hare Intl flights
San Francisco to Ontario flights
Ontario to Seattle flights
Santa Ana to San Francisco flights
Los Angeles to Orlando flights
San Francisco to Santa Ana flights
San Diego to John F Kennedy Intl flights
Burbank to Las Vegas flights
Ontario to Dallas/Fort Worth flights
San Jose to Las Vegas flights
San Francisco to O'Hare Intl flights
San Francisco to Seattle flights
Los Angeles to Denver flights
Los Angeles to Boston flights
Los Angeles to Reagan-National flights
Los Angeles to Sky Harbor Intl flights
Los Angeles to Kahului flights
Santa Ana to Las Vegas flights
Santa Ana to Seattle flights
Ontario to John F Kennedy Intl flights
San Diego to Newark flights
Santa Ana to Dallas/Fort Worth flights
Los Angeles to Hobby flights
San Francisco to San Diego flights
San Francisco to Miami flights
San Francisco to Orlando flights
Ontario to Newark flights
Los Angeles to Baltimore flights
Los Angeles to Salt Lake City flights
San Francisco to Kahului flights
Burbank to LaGuardia flights
Los Angeles to Dulles Intl flights

Top 4 airlines flying from Ontario to Wisconsin

Discover the top 4 airlines that operate flights from Ontario to Wisconsin. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$253Average$427FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$276Average$599FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$288Average$521FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$330Average$427FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.